How do I make a proper American style beef burger?

The tastiest way to cook burgers is on the BBQ, but pan frying works well too. For each burger, use 6-8 oz. of ground beef. The best burgers do contain some fat, so try to purchase chopped/minced beef that is 75-80% lean. One pound of meat is 16 oz. so just divide it in half for large 8 oz. burgers and in thirds for smaller burgers which will be just shy of 6 oz. Shape the meat into patties. Season each side of the patty with salt, preferably Kosher or sea salt and black pepper. Place the patties in a hot skillet, reduce heat to medium high, leave them there until they can easily be turned without sticking to the pan. Cook on the other side for about three minutes. If using a BBQ, cook for about 3-4 minutes on each side depending on the thickness of the patties. Always allow the patties to rest for a minute or two to distribute the juices. Serve on hamburger buns or rolls with lettuce, sliced tomato and sliced onion, or not. In the US burgers are usually served with Ketchup or a combination of mustard and mayonnaise, depending on which part of the country you live in.